Each pair of definitions is for two words, where the second word is the first word with a letter deleted (example: brand & band). The length of the first word in each pair is provided, along with the position of the deleted letter to obtain the second word.

1) globe, earth, universe (5 letters) & (delete 4th letter) a meaningful sound which stands for an idea
2) trained personnel that form the control group of an organization (5 letters) & (delete 3rd letter) a feeling of concern or anxiety
3) a member of the cat family (4 letters) & (delete 1st letter) an atom with an electrical charge
4) on the outside (8 letters) & (delete 2nd letter) unending